Kenji Shibahara

Follow

Person

Osaka, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Sheets for concealing information recorded on recording paper for u...
- Patent number 5,259,031
- Issue date Nov 2, 1993
- Kabushiki Kaisha Challenge Five
- Kenji Shibahara
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Communication medium such as postcard and method of manufacturing t...
- Patent number 5,217,162
- Issue date Jun 8, 1993
- Kabushiki Kaisha Challenge Five
- Kenji Shibahara
- B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER
Information Patent Grant
Sealed letters, postcards and like confidential sheets, and paper,...
- Patent number 5,205,475
- Issue date Apr 27, 1993
- Kabushiki Kaisha Challenge Five
- Kenji Shibahara
- B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER
Information Patent Grant
Two-way communication medium in the form of double post card or the...
- Patent number 5,078,314
- Issue date Jan 7, 1992
- Kabushiki Kaisha Challenge Five
- Kenji Shibahara
- B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER
Information Patent Grant
Two-way communication sheets in the form of double post card, doubl...
- Patent number 5,020,829
- Issue date Jun 4, 1991
- Kabushiki Kaisha Challenge Five
- Kenji Shibahara
- B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER